swift234

SILCombiner: Delete dead partial_apply more aggressively

We used to delete partial_apply with a single strong_release user.

The new array code causes dead partial applys with mulitple
strong_retain/release users. We also want to delete those. Currently, the code
handles the case where all users are retain/releases in the same basic block.

rdar://18840718

Swift SVN r23071